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Fri, 29 Nov 2019 11:38:02 +0100 From: Gilles Buloz To: "linux@roeck-us.net" CC: Gilles Buloz Subject: [PATCH 1/2] hwmon: (nct7802) Fix voltage limits to wrong registers Thread-Topic: [PATCH 1/2] hwmon: (nct7802) Fix voltage limits to wrong registers Thread-Index: AQHVpqETZxldW7Z9bkSlKT2rifv8pA== Date: Fri, 29 Nov 2019 10:38:02 +0000 Message-ID: <5de0f509.rc0oEvPOMjbfPW1w%gilles.buloz@kontron.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Heirloom mailx 12.4 7/29/08 x-originating-ip: [172.25.9.193] x-c2processedorg: 51b406b7-48a2-4d03-b652-521f56ac89f3 Content-ID: <14C586CF40B25D478169C2903432E6AB@snt-world.com> MIME-Version: 1.0 X-SnT-MailScanner-Information: Please contact the ISP for more information X-SnT-MailScanner-ID: 1FD4567A075.AB5FF X-SnT-MailScanner: Not scanned: please contact your Internet E-Mail Service Provider for details X-SnT-MailScanner-SpamCheck: X-SnT-MailScanner-From: gilles.buloz@kontron.com X-SnT-MailScanner-To: linux@roeck-us.net X-Spam-Status: No X-Spam-Status: No, score=0.0 X-Spam-Score: 0 X-Spam-Bar: / X-Spam-Flag: NO Sender: linux-hwmon-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org From: Gilles Buloz Date: Wed, 27 Nov 2019 18:09:34 +0100 Subject: [PATCH 1/2] hwmon: (nct7802) Fix voltage limits to wrong registers in0 thresholds are written to the in2 thresholds registers in2 thresholds to in3 thresholds in3 thresholds to in4 thresholds in4 thresholds to in0 thresholds Signed-off-by: Gilles Buloz --- drivers/hwmon/nct7802.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/hwmon/nct7802.c b/drivers/hwmon/nct7802.c index f3dd2a17bd42..7915c2f2c85d 100644 --- a/drivers/hwmon/nct7802.c +++ b/drivers/hwmon/nct7802.c @@ -23,8 +23,8 @@ static const u8 REG_VOLTAGE[5] = { 0x09, 0x0a, 0x0c, 0x0d, 0x0e }; static const u8 REG_VOLTAGE_LIMIT_LSB[2][5] = { - { 0x40, 0x00, 0x42, 0x44, 0x46 }, - { 0x3f, 0x00, 0x41, 0x43, 0x45 }, + { 0x46, 0x00, 0x40, 0x42, 0x44 }, + { 0x45, 0x00, 0x3f, 0x41, 0x43 }, }; static const u8 REG_VOLTAGE_LIMIT_MSB[5] = { 0x48, 0x00, 0x47, 0x47, 0x48 }; From patchwork Fri Nov 29 10:39:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gilles Buloz X-Patchwork-Id: 11267455 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2C16F930 for ; Fri, 29 Nov 2019 17:54:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EF456216F4 for ; Fri, 29 Nov 2019 17:54:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="rujS4wz5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726971AbfK2Ry0 (ORCPT ); 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Fri, 29 Nov 2019 11:39:34 +0100 Received: from sntmail12r.snt-is.com ([fe80::e551:8750:7bba:3305]) by sntmail12r.snt-is.com ([fe80::e551:8750:7bba:3305%3]) with mapi id 15.01.1713.004; Fri, 29 Nov 2019 11:39:34 +0100 From: Gilles Buloz To: "linux@roeck-us.net" CC: Gilles Buloz Subject: [PATCH 2/2] hwmon: (nct7802) Fix non-working alarm on voltages Thread-Topic: [PATCH 2/2] hwmon: (nct7802) Fix non-working alarm on voltages Thread-Index: AQHVpqFKxcR1fWMFwE6M2gw4QTx4hA== Date: Fri, 29 Nov 2019 10:39:34 +0000 Message-ID: <5de0f566.tBga5POKAgHlmd0p%gilles.buloz@kontron.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Heirloom mailx 12.4 7/29/08 x-originating-ip: [172.25.9.193] x-c2processedorg: 51b406b7-48a2-4d03-b652-521f56ac89f3 Content-ID: <17BD850A68521C409860C1963B93C143@snt-world.com> MIME-Version: 1.0 X-SnT-MailScanner-Information: Please contact the ISP for more information X-SnT-MailScanner-ID: 0A4F967A08B.A0EE8 X-SnT-MailScanner: Not scanned: please contact your Internet E-Mail Service Provider for details X-SnT-MailScanner-SpamCheck: X-SnT-MailScanner-From: gilles.buloz@kontron.com X-SnT-MailScanner-To: linux@roeck-us.net X-Spam-Status: No X-Spam-Status: No, score=0.0 X-Spam-Score: 0 X-Spam-Bar: / X-Spam-Flag: NO Sender: linux-hwmon-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org From: Gilles Buloz Date: Fri, 29 Nov 2019 10:56:05 +0100 Subject: [PATCH 2/2] hwmon: (nct7802) Fix non-working alarm on voltages No alarm is reported by /sys/.../inX_alarm In detail: The SMI Voltage status register is the only register giving a status for voltages, but it does not work like the non-SMI status registers used for temperatures and fans. A bit is set for each input crossing a threshold, in both direction, but the "inside" or "outside" limits info is not available. Also this register is cleared on read. Note : this is not explicitly spelled out in the datasheet, but from experiment. As a result if an input is crossing a threshold (min or max in any direction), the alarm is reported only once even if the input is still outside limits. Also if the alarm for another input is read before the one of this input, no alarm is reported at all. Signed-off-by: Gilles Buloz --- drivers/hwmon/nct7802.c | 71 ++++++++++++++++++++++++++++++++++++++--- 1 file changed, 67 insertions(+), 4 deletions(-) diff --git a/drivers/hwmon/nct7802.c b/drivers/hwmon/nct7802.c index 7915c2f2c85d..35fb352d5a52 100644 --- a/drivers/hwmon/nct7802.c +++ b/drivers/hwmon/nct7802.c @@ -58,6 +58,8 @@ static const u8 REG_VOLTAGE_LIMIT_MSB_SHIFT[2][5] = { struct nct7802_data { struct regmap *regmap; struct mutex access_lock; /* for multi-byte read and write operations */ + u8 in_status; + struct mutex in_alarm_lock; }; static ssize_t temp_type_show(struct device *dev, @@ -368,6 +370,66 @@ static ssize_t in_store(struct device *dev, struct device_attribute *attr, return err ? : count; } +static ssize_t in_alarm_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); + struct nct7802_data *data = dev_get_drvdata(dev); + int volt, min, max, ret; + unsigned int val; + + mutex_lock(&data->in_alarm_lock); + + /* + * The SMI Voltage status register is the only register giving a status + * for voltages. A bit is set for each input crossing a threshold, in + * both direction, but the "inside" or "outside" limits info is not + * available. Also this register is cleared on read. + * Note : this is not explicitly spelled out in the datasheet, but + * from experiment. + * To deal with this we use a status cache with one validity bit and + * one status bit for each input. Validity is cleared at startup and + * each time the register reports a change, and the status is processed + * by software based on current input value and limits. + */ + ret = regmap_read(data->regmap, 0x1e, &val); /* SMI Voltage status */ + if (ret < 0) + goto abort; + + /* invalidate cached status for all inputs crossing a threshold */ + data->in_status &= ~((val & 0x0f) << 4); + + /* if cached status for requested input is invalid, update it */ + if (!(data->in_status & (0x10 << sattr->index))) { + ret = nct7802_read_voltage(data, sattr->nr, 0); + if (ret < 0) + goto abort; + volt = ret; + + ret = nct7802_read_voltage(data, sattr->nr, 1); + if (ret < 0) + goto abort; + min = ret; + + ret = nct7802_read_voltage(data, sattr->nr, 2); + if (ret < 0) + goto abort; + max = ret; + + if (volt < min || volt > max) + data->in_status |= (1 << sattr->index); + else + data->in_status &= ~(1 << sattr->index); + + data->in_status |= 0x10 << sattr->index; + } + + ret = sprintf(buf, "%u\n", !!(data->in_status & (1 << sattr->index))); +abort: + mutex_unlock(&data->in_alarm_lock); + return ret; +} + static ssize_t temp_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -660,7 +722,7 @@ static const struct attribute_group nct7802_temp_group = { static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, 0); static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, 1); static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, 2); -static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, alarm, 0x1e, 3); +static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, in_alarm, 0, 3); static SENSOR_DEVICE_ATTR_2_RW(in0_beep, beep, 0x5a, 3); static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, 0); @@ -668,19 +730,19 @@ static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, 0); static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, 0); static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, 1); static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, 2); -static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, alarm, 0x1e, 0); +static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, in_alarm, 2, 0); static SENSOR_DEVICE_ATTR_2_RW(in2_beep, beep, 0x5a, 0); static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, 0); static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, 1); static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, 2); -static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, alarm, 0x1e, 1); +static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, in_alarm, 3, 1); static SENSOR_DEVICE_ATTR_2_RW(in3_beep, beep, 0x5a, 1); static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, 0); static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, 1); static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, 2); -static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, alarm, 0x1e, 2); +static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, in_alarm, 4, 2); static SENSOR_DEVICE_ATTR_2_RW(in4_beep, beep, 0x5a, 2); static struct attribute *nct7802_in_attrs[] = { @@ -1011,6 +1073,7 @@ static int nct7802_probe(struct i2c_client *client, return PTR_ERR(data->regmap); mutex_init(&data->access_lock); + mutex_init(&data->in_alarm_lock); ret = nct7802_init_chip(data); if (ret < 0)